Improved machine for dressing millstones



ittuited WATSON MCGLAUGHLIN, OF GREENLAND, PENNSYLVANIA.

' Letters'Pateut No. 85,948, dated January 19, 1869.

IMPROVED MACHINE FDR DRESSING MILLSTONES.

The Schedule referred to these IiettersPatent and making part of thesame.

- To all whom it mtl/y concern Be it known that I, WATSON A.MCGLAUGHLIN, of Greenland, in the county of Lancaster, and State ofPennsylvania, `have invented a new and useful Im- The nature of myinvention consists in providing toothed plates, check-beam, and lever,in combination with a sliding frame, carrying a pick-shaft, and'actuated by means of a crank-handle and lifter, so that the feed may notonly be graduated in its motions back and forth, but also heldstationary at any point, in order to cause repeated blows of .the pickto fall on one spot when required.

To enable others skilled in the art to make and use my invention, I willmore fully describe the construction and operation of the same.

A A are two beams, perpendicular on their outer face, and bevelled onthe inner, the better to observe .the action of the blade P P, iig. 3.

' These sills or beams A A are joined, near the ends,

i by a cross-piece, B,which is provided on the upper and inner edge witha groove, for the sliding pieces g G, which support the frame H H P.

The uprights H have side pieces h h below, on their inner tace, so as toform a guide for the ends-s s of the blade-holder W, which has a centralshaft, K, entering through a slot in the cross-piece P, framed from H toH', to unite said uprights.

This shaft K has a` lifting-pin, Y, by which it is actuated bythelifters n, on the shaft N, with its crankhandle O and ily-wheel S.

A pair of springs, X X, is on top of the bladeholdei W.

These springs are compressed, when the shaft and holder K W are raised,by coming in contact `wlth a cross-piece, I, supported on screw-shaftsJ, and made adjustable, by screw-nuts V, above and beneath the same.

The blade-holder W has a groove on the lower side to receive the blade PP, which is secured by a screw and nut, z, centrally on the holder,orotherwise attached, through a perforation in the same.

In order to feed the blade or pick back and forth, I provide a graduatedtoothed or cogged plate, F, tig. 5, which' is aiiixed to the top of thesliding frame G, on the rear, one on each end of the machine, a longi--to the base frame-wol tudinal bar, D, slidingkin a slotted support, O,ailxed This sliding bar has on each end a plate, f, that engages intothe teeth or cogs on the projecting Iedge of the graduated plate F, intowhich it locks or unlocks by sliding the same to the right or the leftby its lever R, moving on a pivot in the upright, U, which latter issecured to the base-frame A B.

To slide the frame that supports the pick or bladeholder' and shaft, Iconnect another longitudinal bar, E, tothe back end of theslidingfoot-pieces Gr.

This bar E is also provided with alever-arm, Q, hinged to a fulcrum, T,connected tothe upright, U, aforesaid, by which the pick-shaft andconnections can be drawn back'and forward, and by the lever R, lockedfrom one tooth or cog to the other, to regulate the distance the groovesare to be cut apart, the force ofthe blow being governed by the springs,and the rapidity by the litters, in making two, three, or four to eachrevolution of the crank-handle.

There is no novelty in the litters and balance-Wheel, nor simply in theaction of shifting the cutter or pick.

I am aware that screw-shafts and cog-gearing are employed to'eifect thesame object in dressing millstones, by machines made portable, andsecured firmly to the stone while dressing the saine.

The obj ect in using along blade is, that a more uniform and level dressis obtained, and inequalities in the face of the stone better or moreeasily rectified than when narrow blades are used. Besides, the blowscan be repeated on the same spot, by my mode of locking the sliding caror framehany number of turns, which is not the case when fed by a screwactuated by the .turning-handle and gear connected therewith. Besides,while it can perform the same amount of work equally as well as if notbetter than the best machine in use for the purpose, it can be builtcheaper, and last longer, than any I know of. v

I am-aware that I am necessarily conned to my arrangement, and do,therefore, not broadly claim any separate part of my machine.

WhatI claim as my invention, and desire to secure by Letters Patent, is-

l. The locking-beam and leverD B, in combination with the lock-plates Ff, arranged-and operating substantially in the manner and'for thepurpose-specified. 2. Also, the arrangement of the lever Q, attached toalongitudinal bar, E, connected to the sliding foot-pieces G, providedwith graduated plates F, in combination -with the blade-holder W, armedwith springs X X,

bearing upon adjustable check-pieces I, in the manner and for thepinpose set forth.

Witnesses: W. A. MCGLAUGHLIN.

WM. B. WILEY, J AooB STAUFFER.

